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Stock Options (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of stock option
   Number of
options		   Weighted
average
exercise
price		   Weighted
average
contractual
term
(years)		   Aggregate
intrinsic
value		 
Outstanding at January 1, 2021   2,595,700   $1.92           
Granted   543,697    2.48           

Exercised

   (16,000)   0.81         40,010 

Cancelled

   (4,667)   0.82         9,564 
Outstanding at March 31, 2021   3,118,730   $2.03    7.39   $2,681,180 
Vested and exercisable at March 31, 2021   1,819,541   $1.95    7.68   $2,029,793 
                     
Outstanding at January 1, 2020   2,004,318   $1.72           
Granted   425,000    2.53           
Forfeited   (9,500)   1.17         4,453 
Expired   -                
Outstanding at March 31, 2020   2,419,818   $1.86    8.05   $539,949 
Vested and exercisable at March 31, 2020   853,485   $2.49    7.77   $226,328 
Schedule of measured fair value of each option award grant using the black-scholes-nerton (BSM) pricing model
    Three Months ended  
    March 31,  
    2021     2020  
Exercise price   $ 2.38 to $2.76     $ 2.53  
Expected life     5.0 years       5.1 years  
Expected volatility     93 %     64 %
Dividend yield     0 %     0 %
Risk-free interest rate     0.31% to 0.93 %     1.67% to 1.72 %